Progress in Optics Vol 42 Author:Emil Wolf Hardbound. This volume present six review articles devoted to various topics of current interest both in classical and in quantum optics. The first article, by S. Ya. Kilin, entitled Quanta and information, is concerned with a multidisciplinary subject which involves optics, information theory, programming and discrete mathematics. The second ar... more »ticle, Optical solitons in periodic media with resonant and off-resonant nonlinearities, by G. Kurizki, A.E. Kozhekin, T.Optatrny and B. Malomed, reviews the properties of optical solitons in periodic nonlinear media. The article which follows, entitled Quantum Zero and inverse quantum Zeno effects, by P. Facchi and S. Pascazio, deals with an effect and its inverse which is a manifestation of hindrance and enhancement, respectively, of the evolution of a quantum system by an external agent, such as a detection apparatus. The fourth article, by M.S. Soskin and M.V. Vasnetsov, discusses the current status of a relat« less